Continuity mistake: When Daniel is just about to leave Larry's office at the end of the film, Daniel is facing away from the door. In the next shot he is facing the other way. (01:25:55)
Visible crew/equipment: At the end of the film, when Natalie Portman stops at customs, look at the bottom left of the screen when she hands over her passport. The bottom half of the camera equipment is reflected in the glass. (01:36:40)
Other mistake: When Alice asks Dan to make her some tea (after he tells her about him and Anna), he walks into the kitchen for just a moment, and comes back to find her gone. He also doesn't see her as he runs downstairs and looks outside. She couldn't have quietly gone down the stairs and out of the building in the short moment that Dan was in the kitchen. If she had moved quickly, there should have been a lot noise from her footsteps.
Factual error: When Julia Roberts takes a photo of Natalie Portman crying she uses a 35mm camera. The final photo in the gallery is from a Hasselblad type camera shooting a square format. All the prints show the full negative and the outside area of the negative. Also when she uses the 35mm camera sometimes she advances the film manually and sometimes you hear a motor drive. It would be either one or the other. Last she doesn't focus the lens when she takes a picture.
Continuity mistake: When Dan is in Larry's office, the bed behind Dan has tissue paper protecting it. After Larry gets up from behind his desk he goes up to Dan. Larry then goes to the bed and pulls a paper sheet over the uncovered bed to ready it for his next patient. Larry was never near the bed in any of the shots before this and even the one rare shot he was not on camera he wouldn't have had time to remove the sheet and get it out of the way.
Other mistake: When Anna takes her first picture of Alice, she lifts the camera to her face, then the shot changes to faraway, and she lifts it to her face again.
Visible crew/equipment: During the doctor's office scene, when Larry walks over to pull the paper across the bed you see beige directors tape on the white rug in a distinct "T" shape instructing Clive Owen (Larry) where to walk.
Factual error: Jude Law and Natalie Portman are chatting on bus number 109, signed 'Westminster' and driving up Whitehall. Route 109 goes from Brixton to Croydon and nowhere near Westminster, and does not use the old Routemaster bus they are on.
Continuity mistake: When Clive Owen throws most of the money at Natalie Portman a bit after he keeps trying to find out her real name, she is putting the money into her handbag. As she is putting the money in her handbag she is holding it up near her chest. The following shot she is still putting the money in her handbag but it is now close to or resting on her legs.
Factual error: When Clive Owen is chatting on the internet to who he thinks is Anna, you can see the URL in web browser. The domain used is "www.nopop." It's impossible for the domain to be missing its top-level suffix (eg. .com).
Other mistake: At Anna's Exhibition, when Natalie Portman is smoking a cigarette, she's smoking a Red (Marlboro), but we can see the White Marlboro (Lights) box when she offers one to Larry (Clive Owen).
Suggested correction: No he's not.
The mistake is valid. After Larry says "Buster", we see Dan standing at an angle with his back towards the opening of the door and doorknob and his left side closest to the door. In the next shot, he's turned more than 90° so that his right side is now closest to the door opening and doorknob.
Bishop73